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Planarized THz quantum cascade lasers for broadband coherent photonics

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Light(Science & Applications) 2022年第12期11卷 3098-3108页

作者： Urban Senica Andres Forrer Tudor Olariu Paolo Micheletti Sara Cibella Guido Torrioli Mattias Beck Jerome Faist Giacomo Scalari Quantum Optoelectronics Group Institute of Quantum ElectronicsETH Zurich8093 ZürichSwitzerland istituto di fotonica e nanotecnologie CNRVia del Fosso del Cavaliere 10000133 RomeItaly

Recently,there has been a growing interest in integrated THz photonics for various applications in communications,spectroscopy and *** present a new integrated photonic platform based on active and passive elements integrated in a double-metal,high-confinement waveguide layout planarized with a low-loss *** extended top metallization keeps waveguide losses low while improving dispersion,thermal and RF properties,as it enables to decouple the design of THz and microwave ***-running on-chip quantum cascade laser combs spanning 800 GHz,harmonic states with over 1.1 THz bandwidth and RF-injected broadband incoherent states spanning over nearly 1.6 THz are observed using a homogeneous quantum-cascade active *** a strong external RF drive,actively mode-locked pulses as short as 4.4 ps can be produced,as measured by *** demonstrate as well passive waveguides with low insertion loss,enabling the tuning of the laser cavity boundary conditions and the cointegration of active and passive elements on the same THz photonic chip.

关键词： waveguide passive tuning

Time reversal of a discrete system coupled to a continuum based on non-Hermitian flip

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Science Bulletin 2017年第12期62卷 869-874页

作者： Stefano Longhi dipartimento di Fisica Politecnico di Milano and Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle RicerchePiazza L.da Vinci 321-20133 MilanoItaly

Time reversal in quantum or classical systems described by an Hermitian Hamiltonian is a physically allowed process, which requires in principle inverting the sign of the Hamiltonian. Here we consider the problem of time reversal of a subsystem of discrete states coupled to an external environment characterized by a continuum of states, into which they generally decay. It is shown that, by flipping the discrete-continuum coupling from an Hermitian to a non-Hermitian interaction, thus resulting in a non unitary dynamics, time reversal of the subsystem of discrete states can be achieved, while the continuum of states is not reversed. exact time reversal requires frequency degeneracy of the discrete states,or large frequency mismatch among the discrete states as compared to the strength of indirect coupling mediated by the continuum. Interestingly, periodic and frequent switch of the discrete-continuum coupling results in a frozen dynamics of the subsystem of discrete states.

关键词： Non-Hermitian dynamicsTime reversalLoschmidt echo

Unidirectional lasing in semiconductor microring lasers at an exceptional point [Invited]

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Photonics Research 2017年第6期5卷 11-16页

作者： STeFANO LONGHI LIANG FeNG dipartimento di Fisica Politecnico di Milano and Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle Ricerche Department of electrical engineering The State University of New York at Buffalo

Recent experiments demonstrated that chiral symmetry breaking at an exceptional point(eP) is a viable route to achieve unidirectional laser emission in microring lasers. By a detailed semiconductor laser rate equation model,we show here that unidirectional laser emission at an eP is a robust regime. Slight deviations from the eP condition can break preferential unidirectional lasing near threshold via a Hopf instability. However, abovea "second" laser threshold, unidirectional emission is restored.

关键词： Unidirectional lasing in semiconductor microring lasers at an exceptional point

Controlling DNA Bundle Size and Spatial Arrangement in Selfassembled Arrays on Superhydrophobic Surface

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Nano-Micro Letters 2015年第2期7卷 146-151页

作者： Gabriele Ciasca Massimiliano Papi Valentina Palmieri Michela Chiarpotto Simone di Claudio Adele De Ninno ennio Giovine Gaetano Campi Annamaria Gerardino Luca Businaro Marco De Spirito istituto di Fisica Universitá Cattolica SC L.go Francesco Vito 100168 Rome Italy istituto di fotonica e nanotecnologie-cnr Via Cineto Romano 42 00156 Rome Italy Institute of Crystallography-cnr Via Salaria Km 290016 Monterotondo Rome Italy

The use of superhydrophobic surfaces(SHSs) is now emerging as an attractive platform for the realization of one-dimensional(1D) nanostructures with potential applications in many nanotechnological and biotechnological *** this purpose, a strict control of the nanostructures size and their spatial arrangement is highly required. However, these parameters may be strongly dependent on the complex evaporation dynamics of the sessile droplet on the SHS. In this work, we investigated the effect of the evaporation dynamics on the size and the spatial arrangement of self-assembled 1D DNA bundles. Our results reveal that different arrangements and bundle size distributions may occur depending on droplet evaporation stage. These results contribute to elucidate the formation mechanism of 1D nanostructures on SHSs.

关键词： Superhydrophobicity DNA array Cassie state Wenzel state 1D nanostructures Self-assembly

Controlling the Cassie-to-Wenzel Transition: an easy Route towards the Realization of Tridimensional Arrays of Biological Objects

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Nano-Micro Letters 2014年第3期6卷 280-286页

作者： G.Ciasca M.Papi M.Chiarpotto A.De Ninno e.Giovine G.Campi A.Gerardino M.De Spirito L.Businaro istituto di Fisica Universit'a Cattolica S. Cuore L.go Francesco Vito 1 I-00168 Roma Italy istituto di fotonica e nanotecnologie - cnr Via Cineto Romano 42 Roma 00156 Italy Institute of Crystallography – cnr Via Salaria Km 29 0016 Monterotondo Roma Italy

In this paper we provide evidence that the Cassie-to-Wenzel transition, despite its detrimental effects on the wetting properties of superhydrophobic surfaces, can be exploited as an effective micro-fabrication strategy to obtain highly ordered arrays of biological objects. To this purpose we fabricated a patterned surface wetted in the Cassie state, where we deposited a droplet containing genomic DNA. We observed that, when the droplet wets the surface in the Cassie state, an array of DNA filaments pinned on the top edges between pillars is formed. Conversely, when the Cassie-to-Wenzel transition occurs, DNA can be pinned at different height between pillars. These results open the way to the realization of tridimensional arrays of biological objects.

关键词： Superhydrophobic patterned surfaces Cassie-to-Wenzel transition DNA arrays

Photonic implementation of boson sampling:a review

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Advanced Photonics 2019年第3期1卷 6-19页

作者： Daniel J.Brod ernesto F.Galvão Andrea Crespi Roberto Osellame NicolòSpagnolo Fabio Sciarrino Universidade Federal Fluminense Instituto de FísicaNiteróiBrazil Consiglio Nazionale delle Ricerche Istituto di Fotonica e NanotecnologieMilanoItaly Politecnico di Milano Dipartimento di FisicaMilanoItaly Sapienza Universitàdi Roma Dipartimento di FisicaRomaItaly

Boson sampling is a computational problem that has recently been proposed as a candidate to obtain an unequivocal quantum computational *** problem consists in sampling from the output distribution of indistinguishable bosons in a linear *** is strong evidence that such an experiment is hard to classically simulate,but it is naturally solved by dedicated photonic quantum hardware,comprising single photons,linear evolution,and *** prospect has stimulated much effort resulting in the experimental implementation of progressively larger *** review recent advances in photonic boson sampling,describing both the technological improvements achieved and the future *** also discuss recent proposals and implementations of variants of the original problem,theoretical issues occurring when imperfections are considered,and advances in the development of suitable techniques for validation of boson sampling *** conclude by discussing the future application of photonic boson sampling devices beyond the original theoretical scope.

关键词： boson sampling multiphoton interference quantum supremacy quantum simulation integrated photonics

Thermally reconfigurable quantum photonic circuits at telecom wavelength by femtosecond laser micromachining

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Light(Science & Applications) 2015年第1期4卷 72-78页

作者： Fulvio Flamini Lorenzo Magrini Adil S Rab Nicolo Spagnolo Vincenzo D’Ambrosio Paolo Mataloni Fabio Sciarrino Tommaso Zandrini Andrea Crespi Roberta Ramponi Roberto Osellame dipartimento di Fisica-Sapienza Universita di Roma P.le Aldo Moro 5I-00185 RomaItaly istituto di fotonica e nanotecnologie-Consiglio Nazionale delle Ricerche(IFNcnr) P.za Leonardo da Vinci32I-20133 MilanoItaly dipartimento di Fisica-Politecnico di Milano P.za Leonardo da Vinci32I-20133 MilanoItaly

The importance of integrated quantum photonics in the telecom band is based on the possibility of interfacing with the optical network infrastructure that was developed for classical *** this framework,femtosecond laser-written integrated photonic circuits,which have already been assessed for use in quantum information experiments in the 800-nm wavelength range,have great *** fact,these circuits,being written in glass,can be perfectly mode-matched at telecom wavelength to the in/out coupling fibers,which is a key requirement for a low-loss processing node in future quantum optical *** addition,for several applications,quantum photonic devices must be dynamically ***,we experimentally demonstrate the high performance of femtosecond laser-written photonic circuits for use in quantum experiments in the telecom band,and we demonstrate the use of thermal shifters,which were also fabricated using the same femtosecond laser,to accurately tune such ***-of-the-art manipulation of single-and two-photon states is demonstrated,with fringe visibilities greater than 95%.The results of this work open the way to the realization of reconfigurable quantum photonic circuits based on this technological platform.

关键词： femtosecond laser micromachining integrated quantum photonics thermal shifters tunable optical circuits

enhanced generation of nondegenerate photon pairs in nonlinear metasurfaces

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Advanced Photonics 2021年第5期3卷 22-27页

作者： Matthew Parry Andrea Mazzanti Alexander Poddubny Giuseppe Della Valle Dragomir N.Neshev Andrey A.Sukhorukov Australia National University Research School of PhysicsCanberraAustralia ARC Centre of excellence for Transformative Meta-Optical Systems CanberraAustralia Politecnico di Milano Dipartimento di FisicaMilanItaly ITMO University Department of PhysicsSaint PetersburgRussia Ioffe Institute Saint PetersburgRussia Consiglio Nazionale delle Ricerche Istituto di Fotonica e NanotecnologieMilanItaly

We predict theoretically a regime of photon-pair generation driven by the interplay of multiple bound states in the continuum resonances in nonlinear *** nondegenerate photon-pair generation is derived from the hyperbolic topology of the transverse phase matching and can enable orders-of-magnitude enhancement of the photon rate and spectral brightness,as compared to the degenerate *** show through comprehensive simulations that the entanglement of the photon pairs can be tuned by varying the pump polarization,which can underpin future advances and applications of ultracompact quantum light sources.

关键词： optics photonics light metasurface spontaneous parametric down-conversion entanglement

diagnostic techniques for photonic materials based on Raman and Brillouin spectroscopies

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Optoelectronics Letters 2007年第3期3卷 188-191页

作者： M. Mattarelli S.Caponi A. Chiappini M. Montagna e. Moser F. Rossi C.Tosello C. Armellini A. Chiasera M. Ferrari Y. Jestin G. Nunzi Conti S. Pelli G.C. Righini dipartimento di Fisica Università di Trento CSMFO groupTrentoItaly INFM CRS-SOFT c/o Universita' di Roma "La Sapienza"I-00185RomaItaly cnr-IFN Istituto di Fotonica e NanotecnologieCSMFO groupTrentoItaly. Photonic Materials and Devices Laboratory IFAC-CNRSesto FiorentinoItaly. cnr Department of Materials and DevicesRomaItaly.

The elastic and vibrational properties of a material, bulk or planar waveguide, are studied by BriUouin and Raman spectroscopy to follow the process of nanocrystals growth in glass-ceramics. The nanoparticles cause the appearance, in the low frequency Raman spectrum, of characteristic peaks, whose position depends on the size of the crystals. At the same time, sharp crystal peaks, due to optical phonons, appear in the Raman spectra, allowing the determination of the nucleated phase, and a frequency shift of the BriUouin peaks is observed.

关键词：拉曼光谱布里渊光谱光子材料诊断技术